There are 26 potential coronavirus vaccines in various phases of trials. Photo: AFPThere are 26 potential coronavirus vaccines in various phases of trials. Photo: AFP
There are 26 potential coronavirus vaccines in various phases of trials. Photo: AFP

Explainer |
How do vaccines and immune systems work, and why could a coronavirus vaccine fail?

  • Six vaccine candidates have reached phase 3 human trials, but it is not uncommon for vaccines to fall at this final hurdle
  • The success of vaccines also comes down to what we expect from them and how long immunity lasts

Topic |   Disease
There are 26 potential coronavirus vaccines in various phases of trials. Photo: AFPThere are 26 potential coronavirus vaccines in various phases of trials. Photo: AFP
There are 26 potential coronavirus vaccines in various phases of trials. Photo: AFP
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